I thought I would share a medieval book curse with you. As you know books in the Middle Ages were considered precious. Stunning examples of illuminated script can still be seen. If I remember rightly the British Museum has a heap. Anyway as so much time, money and effort were put into the creations of these books curses were put in place to protect them.
For him that stealeth, or borroweth and returneth not, this book from its owner, let it change into a serpent in his hand and rend him. Let him be struck with palsy, and all his members blasted. Let him languish in pain crying out for mercy, & let there be no surcease to his agony till he sing in dissolution. Let bookworms gnaw his entrails [. . .] when at last he goeth to his final punishment, let the flames of Hell consume him forever.
From Bibliomania and the Medieval Curse